微地形对高寒固沙植物水分利用特征的影响

doi:10.13866/j.azr.2024.01.06

Abstract

Abstract:

Water is the most critical limiting factor for plant survival, and the study of water utilization in desert plants has become the key to ecological protection and vegetation restoration programs. This study focused on three typical sand-fixing plants: Pinus sylvestris, Populus simonii, and Hippophae rhamnoides, in the sandy land on the east shore of Qinghai Lake, as the research material. The potential water source (varying levels of soil water) and the primary water sources for plants under the influence of micro-topography were analyzed by hydrogen and oxygen stable isotope technology (δ¹⁸O and δD) and the IsoSource isotope mixing model. The results show that: (1) the soil water content demonstrated micro-topography-based differences, which manifested as the soil water content on the windward slope being higher than that on the top of the sand dunes and the middle of the windward slope and the soil water content was at its highest in September. (2) the δ¹⁸O value of the xylem water varied in the tree species under different micro-topographic conditions. The δ¹⁸O values of P. sylvestris in the lowland of the windward slope were the lowest, while those of H. rhamnoides and P. simonii were the least in the middle of the windward slope. (3) marked seasonal variations were observed in the primary sources of water for different plants. In June, P. sylvestris and H. rhamnoides used deep soil water as the major source under varied micro-topographic conditions, while P. simonii mainly used deep soil water at the top of sand dunes. The soil water of the middle-layer was utilized more in the middle and lowlands of the windward slope. Still, with the increase of precipitation, various tree species turned to mainly using the shallow and middle soil water in September. In summary, the water use patterns of sand-fixing plants in the alpine sandy land were influenced by micro-topographic conditions, and varying species showed different degrees of response to precipitation.

Key words: alpine sandy land, stable isotope, micro-topography, plant water source, IsoSource model

FAN Mingyan, TIAN Lihui, ZHOU Hai. Effects of micro-topography on water use characteristics of alpine sand-fixing plants[J].Arid Zone Research, 2024, 41(1): 60-70.

Figures/Tables 8

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样地部位	物种	株高/cm	东西长/cm	南北长/cm	覆盖度/%	密度/株
沙丘顶部	樟子松	57.30±16.89Ba	35.30±7.54Ba	36.40±10.82Ba	0.13±0.06Ba	19
	沙棘	82.20±30.20Ba	81.10±25.44ABa	84.70±25.91ABa	0.73±0.40ABa	63
	小叶杨	195.50±145.13Aa	120.00±104.73Aa	118.70±105.31Aa	2.41±3.51Aa	11
迎风坡中部	樟子松	50.60±13.88Ba	26.60±4.45Bb	30.80±5.94Ba	0.08±0.02Ba	10
	沙棘	73.40±27.02Ba	86.70±40.87Aa	89.10±41.15Aa	0.91±0.72Aa	48
	小叶杨	164.60±46.82Aa	107.30±66.17Aa	120.50±82.79Aa	1.78±2.79Aa	10
迎风坡低地	樟子松	58.50±8.42Ba	32.30±7.94Bab	35.50±9.50Ba	0.11±0.05Ba	22
	沙棘	81.70±22.98Ba	69.80±21.46Ba	78.70±13.22ABa	0.57±0.24Ba	71
	小叶杨	198.90±105.28Aa	125.40±77.10Aa	132.60±84.74Aa	2.21±2.41Aa	14

Effects of micro-topography on water use characteristics of alpine sand-fixing plants

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